DIN 267 Mechanical properties for Nuts

Chemical Composition

As per DIN 267-4

Class C
max.
Mn
min.
P
max.
S
max.
4, 5 and 6 0.50 - 0.110 0.150
8 0.58 0.30 0.060 0.150
10 0.58 0.30 0.048 0.058
12 0.58 0.45 0.048 0.058

Mechanical Properties

As per DIN 267-4

Property Class 4 Class 5 Class 6 Class 8 Class 10 Class 12
Proof load stress
(N/mm^2)
400 500 600 800 1000 1200
Symbol |4| |5| |6| |8| |10| |12|
Hardness Vickers HV5
max.
302 302 302 302 353 353
Hardness Brinell HB
max.
290 290 290 290 335 335
Hardness Rockwell HRC
max.
30 30 30 30 36 36

Class 4 only applies for sizes above M16

Proof Load for Self-Colour or Zinc Nuts

As per DIN 267-4 for typical grades and sizes

Thread size Class 8
N
Class 10
N
Class 12
N
M4 7000 8750 10500
M5 11400 14200 17000
M6 16000 20000 24000
M8 29000 36500 43000
M10 46000 58000 69500
M12 67000 84000 100000
M16 126000 157000 188000
M20 196000 245000 294000
M22 242000 303000 364000
M24 282000 353000 423000
M27 367000 459000 550000
M30 448000 561000 673000
M33 555000 694000 833000
M36 653000 817000 980000
M39 780000 976000 1170000

Nuts with proof load values exceeding 350kN (350 000 N) may be exempted from proof load testing and minimum hardness shall be agreed at the time of purchase.

Proof Load for Hot-Dip Galvanized Nuts with oversize thread

As per DIN 267-10 for typical grades and sizes

Thread size Class 8
N
Class 10
N
M6 13100 17100
M8 25000 32600
M10 40700 52900
M12 60100 78100
M16 115000 150000
M20 188000 236000
M22 236000 295000
M24 273000 342000
M27 359000 450000
M30 440000 551000
M33 547000 685000
M36 645000 808000

Whilst the information is provided in good faith, Andrews Fasteners Ltd are not under any responsibility or liability in respect of errors or information that was found to be incorrect or for any reliance the user may place on it.

↫ Go back